competitive inhibiton; stops metabolic pathway that cell uses to make folic acid (e.g. folic acid is used by the cell to make DNA protein = no replication)

Antibioitic Resistance
(Reasons & Examples)

Resistance do to genetics (e.g. some bacteria create ability to change antibiotics into a food source = resistance)
Overuse/Misuse of antibiotics
(anitbiotics given to healthy livestock = misuse; failure to take antibiotic meds. via full cycle [noncompliance])